 <!--
 * @Author: mat
 * @Date: 2019-12-04 14:56:07
 * @LastEditTime: 2019-12-04 16:31:52
 * @LastEditors: Please set LastEditors
 * @Description: 实现数字翻牌动态效果，css 属性 writing-mode: vertical-lr，使数字竖直排版，
        2d移动 transform: translate(-50%, -40%); y值控制移动至哪个数字，transition 
        控制transform属性有动画效果 
 -->
<template>
  <div class="chartNum" :style="{transform:' scale('+transform+')'}">
    <div class="box-item">
      <li class="text_shadow" :class="{'number-item': !isNaN(item), 'mark-item': isNaN(item) }" v-for="(item,index) in orderNum" :key="index">
        <span v-if="!isNaN(item)" class="text_shadow">
          <i ref="numberItem" class="">0123456789</i>
        </span>
        <span class="comma text_shadow" v-else>{{item}}</span>
      </li>
    </div>
  </div>
</template>
<script>
export default {
  props:{
    number:{
      type:Number|String,
      default:12654
    },
     transform:{
      type:Number|String,
      default:1
    }
  },
  data() {
    return {
      orderNum: ["0", "0", "0", "0", "0", "0", "0", "0"], // 默认订单总数
    };
  },
   watch:{
    number:'toOrderNum'
  },
  mounted() {
    // setTimeout(() => {
      this.toOrderNum(this.number); // 这里输入数字即可调用
    // }, 500);
  },
  methods: {
    // 设置文字滚动
    setNumberTransform() {
      const numberItems = this.$refs.numberItem; // 拿到数字的ref，计算元素数量
      const numberArr = this.orderNum.filter((item) => !isNaN(item));
      // 结合CSS 对数字字符进行滚动,显示订单数量
      for (let index = 0; index < numberItems.length; index++) {
        const elem = numberItems[index];
        elem.style.transform = `translate(-50%, -${numberArr[index] * 10}%)`;
      }
    },
    // 处理总订单数字
    toOrderNum(number) {
      // 把订单数变成字符串
       let num = (Number(number).toFixed(0)).toString();
      // 把订单数变成字符串
      if (num.length < num.toString().length) {
        num = "0" + num; // 如未满八位数，添加"0"补位
        this.toOrderNum(num); // 递归添加"0"补位
      } else if (num.length === num.toString().length) {
        // 订单数中加入逗号
        // num = num.slice(0, 2) + ',' + num.slice(2, 5) + ',' + num.slice(5, 8)
        this.orderNum = num.split(""); // 将其便变成数据，渲染至滚动数组
      } else {
        // 订单总量数字超过八位显示异常
        this.$message.warning("总量数字过大");
      }
      this.setNumberTransform();
    },
  },
};
</script>
<style scoped lang='scss'>
.chartNum {
  // transform: scale(1.2);
}
/*订单总量滚动数字设置*/
.box-item {
  position: relative;
  // height: 100px;
  font-size: 24px;
  line-height: 20px;
  text-align: center;
  list-style: none;
  color: #2d7cff;
  writing-mode: vertical-lr;
  text-orientation: upright;
  /*文字禁止编辑*/
  -moz-user-select: none; /*火狐*/
  -webkit-user-select: none; /*webkit浏览器*/
  -ms-user-select: none; /*IE10*/
  -khtml-user-select: none; /*早期浏览器*/
  user-select: none;
  /* overflow: hidden; */
}
/* 默认逗号设置 */
.mark-item {
  width: 10px;
  height: 42px;
  margin-right: 5px;
  line-height: 10px;
  font-size: 24px;
  position: relative;
  & > span {
    position: absolute;
    width: 100%;
    bottom: 0;
    writing-mode: vertical-rl;
    text-orientation: upright;
  }
}
/*滚动数字设置*/
.number-item {
  // width: 41px;
  // height: 75px;
  width: 25px;
  height: 42px;
  /* 背景图片 */
  background: url("../../assets/images/echarts/numbj2.png");
  background-size: 135% 125%;
  background-position: center;
  //   // background: #ccc;
  //   -webkit-box-shadow:0px 3px 3px #c8c8c8 inset;

  // -moz-box-shadow:0px 3px 3px #c8c8c8 inset;

  // box-shadow:0px 3px 3px #c8c8c8 inset;

  list-style: none;
  margin-right: 2px;
  // padding:2px;
  // background:rgba(250,250,250,1);
  border-radius: 4px;
  // border: 1px solid rgba(221, 221, 221, 1);
  & > span {
    position: relative;
    display: inline-block;
    margin-right: 10px;
    width: 100%;
    height: 100%;
    writing-mode: vertical-rl;
    text-orientation: upright;
    overflow: hidden;
    & > i {
      font-style: normal;
      position: absolute;
      top: 8px;
      left: 50%;
      color: #e1fefe;
      transform: translate(-50%, 0);
      transition: transform 1s ease-in-out;
      letter-spacing: 10px;
    }
  }
}
.number-item:last-child {
  margin-right: 0;
}
</style>